B-52Bs reached the end of their structural service life by the mid-1960s and all were retired by June 1966, followed by the last of the B-52Cs on 29 September 1971; except for NASA's B-52B "008" which was eventually retired in 2004 at Edwards AFB, California. Another of the remaining B Models, "005" is on display at the Wings Over the Rockies Air and Space Museum in Denver, Colorado.

A few time-expired E models were retired in 1967 and 1968, but the bulk were retired between May 1969 and March 1970. Most F models were also retired between 1967 and 1973, but 23 survived as trainers until late 1978.

The fleet of D models served much longer. Eighty D models were updated under the Pacer Plank program (ECP 1581) at Boeing's Wichita plant. Skinning on the lower wing and fuselage was replaced, and various structural components were renewed. Work was completed in 1977. The fleet of D models stayed largely intact until late 1978, when 37 were retired. The remainder were retired between 1982 and 1983.

The remaining G and H models were used for nuclear standby ("alert") duty as part of the United States' nuclear triad. This triad was the combination of nuclear-armed land-based missiles, submarine-based missiles and manned bombers. The B-1B Lancer which was intended to supplant the B-52, replaced only the older models and the supersonic FB-111.

After the fall of the Soviet Union, the B-52Gs were destroyed per the terms of the Strategic Arms Reduction Treaty (START). AMARG was tasked with eliminating 365 B-52 bombers. The progress of this task was to be verified by Russia via satellite and first-person inspection at the AMARG facility. Initially, the B-52s were chopped into pieces with a 13,000 pound guillotine.

In 1991, B-52s ceased continuous 24-hour SAC alert duty.

Gulf war and later

On 16 February 1991 a flight of B-52Gs launching from and returning to Barksdale AFB, in Louisiana, struck targets inside Iraq. This was at the time the longest distance combat mission in history: 35 hours and 14,000 statute miles round trip. Over the next months, B-52Gs operating from bases in the United Kingdom, Spain and on the island of Diego Garcia flew low level bombing missions. The B-52s moved to high level missions after Coalition forces ensured air superiority and were able to suppress air defense systems capable of reaching bombers at a higher altitude. B-52s were an important part of the air war during Operation Desert Storm as they could be employed with impunity. The conventional strikes were carried out by three bombers dropping 153 750 pound bombs at a time, covering an area one and a half miles long by one mile wide. The bombings demoralized the defending Iraqi troops, and they could be induced to surrender rather than be destroyed. Flying approximately 1620 sorties in the Gulf War, B-52s delivered 40% of the weapons dropped by coalition forces, while suffering only one aircraft loss, with several receiving minor damage from enemy action.

On 2�3 September 1996, two B-52H struck Baghdad power stations and communications facilities with 13 AGM-86C air-launched cruise missiles (ALCM) as part of Operation Desert Strike, a 34-hour, 16,000 statute mile round trip mission from Andersen AFB, on Guam�the longest distance ever flown for a combat mission. Only two days prior, the crews had completed a 17-hour flight from Louisiana to Guam.

The B-52 also contributed to the US success in Operation Enduring Freedom in 2001 (Afghanistan/Southwest Asia), providing the ability to loiter high above the battlefield and provide Close Air Support (CAS) through the use of precision guided munitions, a mission which previously would have been restricted to fighter and ground attack aircraft.

B-52s also played a role in Operation Iraqi Freedom, which commenced on 20 March 2003 (Iraq/Southwest Asia). On the night of 21 March 2003, B-52Hs launched at least 100 AGM-86 ALCMs.

The B-52H, the only variant still in service, is currently active in:

– 2nd Bomb Wing at Barksdale Air Force Base, Louisiana
– 5th Bomb Wing at Minot Air Force Base, North Dakota
– 917th Wing (Air Force Reserves) at Barksdale Air Force Base, Louisiana
– an additional airframe is used by the Air Force Flight Test Center.
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